From nobody Thu Nov 6 18:27:52 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1542470303985550.5827969386308; Sat, 17 Nov 2018 07:58:23 -0800 (PST) Received: from localhost ([::1]:49694 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gO2z9-0005Aw-MO for importer@patchew.org; Sat, 17 Nov 2018 10:58:15 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44452) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gO2x0-0003xH-KY for qemu-devel@nongnu.org; Sat, 17 Nov 2018 10:56:03 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gO2wy-0000hC-Oe for qemu-devel@nongnu.org; Sat, 17 Nov 2018 10:56:02 -0500 Received: from mx2.rt-rk.com ([89.216.37.149]:60468 helo=mail.rt-rk.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gO2wy-0000gE-CG for qemu-devel@nongnu.org; Sat, 17 Nov 2018 10:56:00 -0500 Received: from localhost (localhost [127.0.0.1]) by mail.rt-rk.com (Postfix) with ESMTP id C1AD31A2045; Sat, 17 Nov 2018 16:54:55 +0100 (CET) Received: from rtrkw774-lin.domain.local (rtrkw774-lin.domain.local [10.10.13.43]) by mail.rt-rk.com (Postfix) with ESMTPSA id 9D0531A20A1; Sat, 17 Nov 2018 16:54:55 +0100 (CET) X-Virus-Scanned: amavisd-new at rt-rk.com From: Aleksandar Markovic To: qemu-devel@nongnu.org Date: Sat, 17 Nov 2018 16:54:39 +0100 Message-Id: <1542470080-5797-11-git-send-email-aleksandar.markovic@rt-rk.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1542470080-5797-1-git-send-email-aleksandar.markovic@rt-rk.com> References: <1542470080-5797-1-git-send-email-aleksandar.markovic@rt-rk.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 89.216.37.149 Subject: [Qemu-devel] [PULL 10/11] target/mips: Disable R5900 support X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, amarkovic@wavecomp.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Aleksandar Markovic Disable R5900 support. There are some outstanding issues related to ABI support and emulation accuracy, that were not understood well during review process. Disable to avoid backward compatibility issues. Reverts commit ed4f49ba9bb56ebca6987b1083255daf6c89b5de. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Aleksandar Markovic --- target/mips/translate_init.inc.c | 59 ------------------------------------= ---- 1 file changed, 59 deletions(-) diff --git a/target/mips/translate_init.inc.c b/target/mips/translate_init.= inc.c index 85da4a2..acab097 100644 --- a/target/mips/translate_init.inc.c +++ b/target/mips/translate_init.inc.c @@ -411,65 +411,6 @@ const mips_def_t mips_defs[] =3D .mmu_type =3D MMU_TYPE_R4000, }, { - /* - * The Toshiba TX System RISC TX79 Core Architecture manual - * - * https://wiki.qemu.org/File:C790.pdf - * - * describes the C790 processor that is a follow-up to the R5900. - * There are a few notable differences in that the R5900 FPU - * - * - is not IEEE 754-1985 compliant, - * - does not implement double format, and - * - its machine code is nonstandard. - */ - .name =3D "R5900", - .CP0_PRid =3D 0x00002E00, - /* No L2 cache, icache size 32k, dcache size 32k, uncached coheren= cy. */ - .CP0_Config0 =3D (0x3 << 9) | (0x3 << 6) | (0x2 << CP0C0_K0), - .CP0_Status_rw_bitmask =3D 0xF4C79C1F, -#ifdef CONFIG_USER_ONLY - /* - * R5900 hardware traps to the Linux kernel for IEEE 754-1985 and = LL/SC - * emulation. For user only, QEMU is the kernel, so we emulate the= traps - * by simply emulating the instructions directly. - * - * Note: Config1 is only used internally, the R5900 has only Confi= g0. - */ - .CP0_Config1 =3D (1 << CP0C1_FP) | (47 << CP0C1_MMU), - .CP0_LLAddr_rw_bitmask =3D 0xFFFFFFFF, - .CP0_LLAddr_shift =3D 4, - .CP1_fcr0 =3D (0x38 << FCR0_PRID) | (0x0 << FCR0_REV), - .CP1_fcr31 =3D 0, - .CP1_fcr31_rw_bitmask =3D 0x0183FFFF, -#else - /* - * The R5900 COP1 FPU implements single-precision floating-point - * operations but is not entirely IEEE 754-1985 compatible. In - * particular, - * - * - NaN (not a number) and +/- infinities are not supported; - * - exception mechanisms are not fully supported; - * - denormalized numbers are not supported; - * - rounding towards nearest and +/- infinities are not supported; - * - computed results usually differs in the least significant bit; - * - saturations can differ more than the least significant bit. - * - * Since only rounding towards zero is supported, the two least - * significant bits of FCR31 are hardwired to 01. - * - * FPU emulation is disabled here until it is implemented. - * - * Note: Config1 is only used internally, the R5900 has only Confi= g0. - */ - .CP0_Config1 =3D (47 << CP0C1_MMU), -#endif /* !CONFIG_USER_ONLY */ - .SEGBITS =3D 32, - .PABITS =3D 32, - .insn_flags =3D CPU_R5900 | ASE_MMI, - .mmu_type =3D MMU_TYPE_R4000, - }, - { /* A generic CPU supporting MIPS32 Release 6 ISA. FIXME: Support IEEE 754-2008 FP. Eventually this should be replaced by a real CPU model. = */ --=20 2.7.4